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<h1>derive</h1>
<p>Preform numerical derivation on a single parameter function. Note: Numerical derivation algorithms can't be acurate, so use this function with caution. (may return wrong results) </p>
<h2>parameters:</h2>
<ol>
  <li>The function (an expression parseable by the eval command)</li>
  <li>The derivation point</li>
</ol>
